Door-lock.



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UNITED STATES PATENT OFFICE.

ELEK TOTH, OF LUGOS, AUSTRIA-HUNGARY.

oooR- SPECIFICATION forming part of Letters Batent No. 720,757, datedFebruary 17', 1903.

Application filed April 28, 1902.

To all whom, it may concern.-

Be it known that I, ELEK TOTH, a subjec of the Emperor ofAustria-Hungary, and a resident of Lugos, AustriaHungary, have inventedcertain new and useful Improvements in Door-Locks, of which thefollowing is a full, clear, and exact description.

The present invention relates to improve ments in door-locks 5 anditconsists,essentially, in arranging the part of the said lock so as toenable the same to be locked and unlocked from either side by the aid ofa key inserted in a keyhole provided in the knob or handle of the look.

In order to render the present specification easily intelligible,reference is had to the accompanying drawings, in which similar lettersof reference denote similar parts throughout the several views.

Figure 1 is a vertical section through the lock and both knobs. Figs. 2and 3 are elevations of the two knobs seen from the right and left handsides of Fig. 1, respectively, the coverplate being removed in bothcases. Fig. 4 is a section on the line A A of Fig. 1 seen in thedirection of the arrows, and Fig.' 5 is a general elevation of the wholelock with the knob removed and the knob-bar in cross section.

The lock-casing a is fixed in the door in the usual manner and providedat either side with knobs 'o and d, which are mounted on the spindle e,on which the boss I) of the bolt-operating lever-arm b, Fig. 5, ismounted. The stationary ring it, surrounding the said boss I), isprovided with a recess h, and when the head of a sliding bolt entersthis recess the boss, and with it the arm I), will be prevented fromturning, and thus the lock will be locked. The knobs c and d are hollowand provided with covers '6, advantageously screwed onto the same.Within the knobs, advantageously above the spindle 6', two sliding boltsf, one extending from the boss of the arm 12 into each knob, areprovided, being suitably guided in the said knobs and normally pressedoutwardly by means of springs Z Z. The inner ends of the bolts arecranked at g, so as to engage the recesses 71 of the stationary rings hwhen the said bolts are pressed inwardly by means of a key. The forwardends of the bolts f extend through the two plates 11 and Serial No.105,054; on model.)

n of each handle and are advantageously rounded to receive the key. Theother portions of the said bolts are square or of other suitablecross-section adapted to prevent their turning in their bearings. Towardthe knob end of the said bolts they are each provided with a notch f,into which a pawl m, Fig. 4, is adapted to spring under the influence ofthe pawl-spring 0 when the said bolts have been pushed inwardly by meansof the key. When the said pawlis in engagement with the said notch, thebolts are locked with the inner ends in engagement with the recess h ofthe corresponding ring h'n In order to render it possible to open thedoor by means of the key from either side,

whichever of the two bolts f may have been locked, the following deviceis employed: Advantageously within the spindle e itself a bar '1' ismounted, Figs. 1 and 5, said bar being made in two parts, coupled at 'r'in order to render the fitting together of the look more convenient. Atthe right-hand side-the said bar is provided with a crank-arm s,normally held up in the slot n of the plate 0% by means of a spring t,the end of the said crank extending slightly beyond the said plate n. At

the left-hand end of the bar 7 the same is provided with a pinion it,which meshes with a pinion a, mounted on a stub-shaft r suitablysupported in the lefthand knob and having its crank-arm .9 extendingthrough the plate a in a slot 4:, similar to the arrange ment within theright-hand knob, the said crank-arm 3" being held up in its slot bymeans of the spring t. The cover-plates 21 of the knobs and the forwardinner plates at are provided with corresponding keyholes k and k, andthe knobs are mounted in the plates 13 in the well-known manner.

The lock is manipulated in the following manner: When the door isunlocked, the bolts f are pressed outwardly by means of their springs11, and the door maybe opened and closed in the usual manner by simplyturning the handles or knobs. When it is required to lock the door fromeither side, it is only necessary to insert the key and press one of thebolts ,1 inwardly, when the pawl m will spring into the recess or notchf and retain the said bolt with its inner end in the recess h of thestationary ring it and pre- ICG vent the movement of the bolt-operatingarm I). In order to unlock the door, the key is inserted and thenturned, when the bit will depress the crank-arm s or 8, according towhich side the said key is inserted, against the action of itsrespective spring or t, and the end of the said crank-arm will push backits respective pawl on out of engagement with the notch f, so that theboltf is free and Will be thrown back by the operation of its spring Z.

It will be clear from the foregoing description that it is quiteimmaterial from which side the door is unlocked, since both crankarms 3and s will be moved simultaneously from either side owing to the actionof the bar r and the pinions u and it. It is also evident that the lockmay be provided with any of the known devices which render it operableby means of a certain key only; but as these devices are known in agreat variety it is not necessary to describe the same.

I claim as my invention 1. In a doom-lock having a knob mounted at eachside of the door and a spindle to connect the said knobs, thecombination of a pair of longitudinally-sliding bolts having their innerends adapted to engage in stationary recesses at each side of the doorand mounted Within the said knobs and a keyhole in the ends of the saidknobs to operate said b'olts from either side to lock the doorsubstantially as described.

2. In a door-lock having knobs as specified and a spindle connecting thesame, an arm on the said spindleto operate the door-lock bolt, thecombination of a pair of bolts mounted one in each knob, a stationaryring having a recess, one such ring being mounted at each side of thedoor, a keyhole in each knob to enable either of the said bolts to bepushed forward, means for arresting the bolt operated in its forwardposition and means for releasing the said bolt, on inserting the keyfrom either side of the door in the manner and for the purposesubstantially as described.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

ELEK TOTH.

Witnesses: I

KAISER GIZELLAY, TOTH IGNAZ.

